Honda rs nf4 109mm rod.

Sujet: Honda rs nf4 109mm rod. Dim 29 Mar 2020 - 21:24

I have a proyect on a Honda rs 125 nf4 with a nx4 95' barrel

The proyect is that I want to change the rod from 104mm to 109mm with a 24mm piston height instead of 29mm.

I saw a italkit kit of long rod a short piston (similar than aprilia rsw piston). The piston is 143gr with ring and pin.

What do you guys think about it?

Thanks

Hello
If you do this, you will need a new cylinder head,
because the "alt. height" of nf4 piston is 2.5mm instead of 2.0mm for aprilia gp piston,
so no good squish band angle.

I have asked me the same question with a rotax 122 engine, but not enough money to realize it…

Good luck

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